Heriyanto, H., Z. Zaenuri, and W. Walid. “Analisis Kemampuan Berpikir Kreatif Siswa Sekolah Menegah Pertama”. PRISMA, Prosiding Seminar Nasional Matematika, Vol. 3, Feb. 2020, pp. 587-90, https://journal.unnes.ac.id/sju/prisma/article/view/37716.